Mailbox assembly



FIG. 1 is a left side elevational view of a mailbox assembly showing my new design, the right side view being a mirror image thereof;

FIG. 2 is a front elevational view, the rear elevational view being a mirror image thereof;

FIG. 3 is a top view of FIG. 1; and,

FIG. 4 is a bottom view. 

The ornamental design for a mailbox assembly, as shown and described. 